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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K2LaP2Se7 by Materials Project

K2LaP2Se7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 10-coordinate geometry to six Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.72 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.34–3.81 Å. La2+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of La–Se bond distances ranging from 3.06–3.26 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four Se2- atoms. There are a spread of P–Se bond distances ranging from 2.22–2.25 Å. In the second P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are one shorter (2.20 Å) and two longer (2.21 Å) P–Se bond lengths. There are seven inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a distorted see-saw-like geometry to two equivalent K1+, one La2+, and one P5+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to two K1+, one La2+, and one P5+ atom. In the third Se2- site, Se2- is bonded in a 1-coordinate geometry to three K1+, one La2+, and one P5+ atom. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to two K1+, one La2+, and one P5+ atom. In the fifth Se2- site, Se2- is bonded in a 1-coordinate geometry to two K1+, one La2+, and one P5+ atom. In the sixth Se2- site, Se2- is bonded in a 4-coordinate geometry to two K1+, one La2+, and one P5+ atom. In the seventh Se2- site, Se2- is bonded in a 4-coordinate geometry to one K1+, two equivalent La2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3La(PSe4)2 by Materials Project

K3La(PSe4)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of K–Se bond distances ranging from 3.38–4.04 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.46–4.11 Å. In the third K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.36–3.95 Å. La3+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of La–Se bond distances ranging from 3.06–3.62 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four Se2- atoms. There are a spread of P–Se bond distances ranging from 2.20–2.25 Å. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four Se2- atoms. There are a spread of P–Se bond distances ranging from 2.19–2.25 Å. There are eight inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to two K1+, two equivalent La3+, and one P5+ atom. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the third Se2- site, Se2- is bonded in a 1-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to five K1+ and one P5+ atom. In the fifth Se2- site, Se2- is bonded to four K1+ and one P5+ atom to form distorted edge-sharing SeK4P square pyramids. In the sixth Se2- site, Se2- is bonded in a 5-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the seventh Se2- site, Se2- is bonded in a 1-coordinate geometry to two K1+, two equivalent La3+, and one P5+ atom. In the eighth Se2- site, Se2- is bonded in a 1-coordinate geometry to three K1+, two equivalent La3+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KLa(PSe3)2 by Materials Project

KLa(PSe3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Se2- atoms. There are a spread of K–Se bond distances ranging from 3.39–3.84 Å. La3+ is bonded in a 9-coordinate geometry to nine Se2- atoms. There are a spread of La–Se bond distances ranging from 3.12–3.41 Å. There are two inequivalent P4+ sites. In the first P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of P–Se bond distances ranging from 2.20–2.23 Å. In the second P4+ site, P4+ is bonded in a trigonal non-coplanar geometry to three Se2- atoms. There are a spread of P–Se bond distances ranging from 2.19–2.21 Å. There are six inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to two equivalent K1+, one La3+, and one P4+ atom. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to two equivalent La3+ and one P4+ atom. In the third Se2- site, Se2- is bonded in a 4-coordinate geometry to two equivalent K1+, one La3+, and one P4+ atom. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to one K1+, two equivalent La3+, and one P4+ atom. In the fifth Se2- site, Se2- is bonded in a 1-coordinate geometry to one K1+, two equivalent La3+, and one P4+ atom. In the sixth Se2- site, Se2- is bonded in a 1-coordinate geometry to two equivalent K1+, one La3+, and one P4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K8La(PSe4)4 by Materials Project

K8La(PSe4)4 crystallizes in the orthorhombic I222 space group. The structure is three-dimensional. there are three inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight Se+1.94- atoms. There are a spread of K–Se bond distances ranging from 3.29–3.63 Å. In the second K1+ site, K1+ is bonded to eight Se+1.94- atoms to form distorted KSe8 hexagonal bipyramids that share corners with four equivalent KSe8 hexagonal bipyramids, an edgeedge with one LaSe8 hexagonal bipyramid, and edges with four equivalent PSe4 tetrahedra. There are a spread of K–Se bond distances ranging from 3.45–3.94 Å. In the third K1+ site, K1+ is bonded in a 6-coordinate geometry to six Se+1.94- atoms. There are a spread of K–Se bond distances ranging from 3.47–3.72 Å. La3+ is bonded to eight Se+1.94- atoms to form distorted LaSe8 hexagonal bipyramids that share edges with two equivalent KSe8 hexagonal bipyramids and edges with four equivalent PSe4 tetrahedra. All La–Se bond lengths are 3.17 Å. P5+ is bonded to four Se+1.94- atoms to form PSe4 tetrahedra that share an edgeedge with one LaSe8 hexagonal bipyramid and edges with two equivalent KSe8 hexagonal bipyramids. There are a spread of P–Se bond distances ranging from 2.22–2.25 Å. There are four inequivalent Se+1.94- sites. In the first Se+1.94- site, Se+1.94- is bonded in a 1-coordinate geometry to four K1+ and one P5+ atom. In the second Se+1.94- site, Se+1.94- is bonded in a 6-coordinate geometry to five K1+ and one P5+ atom. In the third Se+1.94- site, Se+1.94- is bonded in a 5-coordinate geometry to three K1+, one La3+, and one P5+ atom. In the fourth Se+1.94- site, Se+1.94- is bonded in a 1-coordinate geometry to three equivalent K1+, one La3+, and one P5+ atom.

36 MATERIALS SCIENCE↗